Knife grinder for looms



March 1 1927.

s. P. FINDLAY ET AL KNIFE GRINDER FOR LOOMS 2 Sheets-Sheet 1 Filed NOV. 19, 1923 Alva/7017s 0150. F. HNDLAY WM. W Jofl/vm/v,

March 1 1927. w 1,619,410

G. P. FINDLAY ET AL KNIFE GRINDER FOR LOOMS Filed Nov. 19. 1923 2 Sheets-sheaf 2 Patented Mar. 1, 1927.

UNITED STATES GEORGE r, FINDLAY AND WILLIAM w. JOHNSTON, or wOROEsTnR, MASSACHUSETTS,

ASSIGNORS To CROMPTON & KNOwLEs' LOOM WORKS, or some, A CORPORATION or MASSACHUSETTS.

PATENT OFFICE.

WORCESTER, MASSACHU- KNIFE 'GRINDER FOR LOOMS.

Application filed November This invention relates to carpet looms of the Axminster type and particularly to improved mechanism for grinding the pile cutting knives in such looms. These looms are 5 now built of greater width than has been heretofore customary and accurate grinding of the longer knives has become correspondingly more difficult.

It is the object of our invention to provide a grinding mechanism or attachn'ient for such looms, by means of which the knives may be ground accurately and their outline preserved, without depending upon the skill of the operator to produce this result.

An important feature of our invention re-- lates tothe provision of an improved portable grinder having guiding and supporting elements by which it is well adapted to the purpose described.

' Another feature relates to the provision of means for supportingand guiding the grinder on the knives while in the loom, to the end that an accurate edge of desired outline may be produced.

Our invention further relates to arrangements and combinations of parts which will be hereinafter described and more particuuarly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings in which- Fig. 1 is a plan view of portions of the front and back knives of an 'Axminster carpet loom, with our improved grinder mechanism mounted thereon in position to grind the front knife;

Fig. 2 is anienlarged sectional elevation, taken along the line 22 in Fig. 1;

Fig. 3 is a plan view of the grinder;

Fig. 4 is a side elevation thereof;

Fig. 5 is a sectional elevation, taken along the line 55 in Fig. at;

Fig. 6 is a diagrammatic view similar to Fig. 2 but showing the grinder in positionfor grinding the back knife;

Fig. 7 is an edge view of one of the guiding or supporting bars;

Fig. 8 is a view showing the means for clamping one end of the grooved guide bar to the knife on which it is mounted;

Fig. 9 is a sectional elevation, takenalong the line 99,in Fig. 8;

Fig.10 is a front elevation showing the means for securing the Opposite end of the 19, 1923. Serial No. 675,467.

grolovcd guide bar to its supporting knife; ant

Fig-11 is a perspective view, showing one:

and driven by a small high speed electric motor 23 suitably connected in any usual manner to a convenient source of power.

The, casing of themotor 23 is provided with an offset projection 24 having a stud 25 projecting therefrom and rotatably mount-m ed in a bearing 26 in a carriage or support 26. An arm 27 is fiXedto the stud 25 and an adjusting screw 28 (Fig. 5) extends through a slot 29 in the arm 27 and is threaded in the carriage or support 26. A shoul der 30 on the screw 28 engages the Outer surface of the arm 27 and a spring '31 yieldingly moves the arm 27 outward against the shoulder 30. By adjustment ofthe screw 28, the

grinding wheel W may be moved toward or from the knife edge during the grinding operatl 011. j

The carriage or frame 26 is provided with a pa1r of'supporting lugs 32 (Fig. i) and also with a projecting arm 38having an additional supporting lug 34. The lugs 32 and 34 are preferably of hardened steel and are adapted to slide upon guide bars 35and 36. The guide bar 35 has a semi-circular groove .01. recess in its upper face adapted to receive the supporting lugs 32, while the guide bar 36 has a flat upper face to support the lug 34. Thetwo spaced lugs 32 and the single .lug 34 provide a three-point support for the grinder.

It is essential that the guide bars shall be accurately positioned. on the front and back knives prior to the grinding Operation and we have indicated in the drawings certain.

The bar is provided with an inverted Wedge at one end thereof and with a screw ll adapted to engage a fiXed pol tion' 42of the loom and move the bar 35 longitudinal-ly uhtilthe wedge 40 engages the under side of the knife and firmly seats the banonthe knife." lVhen thebar 35-isthus positioned long-itudinally by the screw 41 ai'id has been adjusted transversely by the gaugeblocks 37 a clamp 43 may be used to secure the opposite end ofthe bar in position and additional clamps may be used at intermediate points if found necessary, these clamps being si ngly' re'moved to permit passage of the grinder alfong the knife. A spacing screw 4&(F1g; 9) may be threaded in the bar 35 and may be used to prevent acciden al transverse displacement of the bar35.

The flats-hide bar 36 need not be as'accurately positioned on its knife andis provided with simplespring clips (Figs. 2 and 6') which it may be secured to the upper face of the knives 20 or 21. The bar 36' is shown asvarying in thickness, (see Fig. 7) a construction required when the knives are notkstrictly parallel When in spaced relation.

In the use of our improved grinder mechanism, the guide bars 35 and 36 are first accura-tel'y located an'd 'secured to the knives as above described and the wheel W is then adjusted by thescreiv 28 to engage theedge of the knife at the desired angle. The

grinder is then moved back and forth along the knife and the grinder Wheel 1s further advanced if necessary until? the deslred edge is securedom the knife. i

The Q-LTlIdGbfLl'S 35 a nd36 are then interchanged and adjusted and the second knife edge"isthensimilarly ground. We,

have thus provided convenient and simple grinding mechanism. by whlc'h: the; edges of long pile cutting knives may be conveniently and accurately ground Without removing the-knrves'fronrthe loom.- i Hav1ng thus described our invention and 1;A' mechanism: for grinding the knives of a carpet loom comprising a pair of guide bars, means to: secure said bars 1n position on said knives when said knives'are in spaced relation, and a slidingframe supporting a grinding wheel; and driving mechanism therefor, said frame being movable on and guided" bv saidrbars' to present said Wheel in predetermined-relatien to a knife edge. V 1 l 2. A mechanism for grinding the knives of a carpet loom comprisinga pair of" guide bars, means to secure saidbars inposition on said knives when said knives are in spaced relation, and a sliding frame supporting a grinding wheel and driving mechanismltherefoigi sai'di'trame being movable on and guided by sa-id'bars to present said wheel in predetermined relationto a; knifeedge, and said frame having means to adjustthe grinding Wheel toward and from the knife edge.

3. Amechanisin; for grinding the knives of a carpet loom comprising a pairofiguide bars, means to secure said bars inposition on said knives when sa d lmivesarem spaced relation, and a sliding trame supporting a grinding wheel and driving mechanism of a earpetloom asset forth in claimwL, in

which 'oneao f said guidesbars is grooved to rece1ve a pair of supportingxlugsw onsaid third lug mounted on: offset projection of said frame.

5. A mechanism for "grinding the knives of a carpet loom as set fortlr'inclaiinrrhfin 6'. A mechanism for grinding the knives a three-point support on slidin gframe and the other bar supports It 1 which the securing means includes devicesi r to clamp a guide to arkmfe, and means to adjust. said part-1 transversely on said knife.

of a carpet loom as set forth in" claim 1,;in.

which one of said guide bars hasizvpl-urality of gauge blocks detachably secured thereto for locating said baron its knife; 1 i

1:. A mechan sm fOF'I'IIIdIDg'thB knives of a carpet loom as set fortlt in-claim Lin.-

which one of said guide bars-hash plurality of gauge blocks 5 detachaililyusecuredz thereto for locating saidbaron its knife, and in which said'gmuge blocks are eachprovided with 'a: shoulder to engage the; edge of said knife and position the bar relaztively thereto.

8; A m'echanism for grinding the" knives of a carpetloom as set-forth in; claim 1 in which one of said guide bars has an inverted edge to engage the lower face of its knife and 1n which means is provided tomovesanl 

